INVESTMENTS IN JOINT VENTURES - Summary of Combined Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Statement of Earnings
Total net sales	$ 3,671.4	$ 3,542.9	$ 3,357.7
Total gross margin	327.4	421.3	374.9
Total earnings after income taxes	170.0	207.1	162.1
Ardent Mills
Statement of Earnings
Total net sales	3,476.0	3,344.1	3,180.0
Total gross margin	281.9	386.5	340.3
Total earnings after income taxes	151.9	197.0	152.0
Balance Sheet
Current assets	952.6	974.6
Noncurrent assets	1,669.8	1,675.7
Current liabilities	361.2	355.6
Noncurrent liabilities	496.9	510.9
Others
Statement of Earnings
Total net sales	195.4	198.8	177.7
Total gross margin	45.5	34.8	34.6
Total earnings after income taxes	18.1	10.1	$ 10.1
Balance Sheet
Current assets	89.2	76.4
Noncurrent assets	19.0	15.5
Current liabilities	43.4	37.5
Noncurrent liabilities	$ 0.7	$ 0.1